1417 lines
49 KiB
Zig
1417 lines
49 KiB
Zig
const builtin = @import("builtin");
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const std = @import("../std.zig");
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const event = std.event;
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const assert = std.debug.assert;
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const testing = std.testing;
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const os = std.os;
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const mem = std.mem;
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const windows = os.windows;
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const Loop = event.Loop;
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const fd_t = os.fd_t;
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const File = std.fs.File;
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const Allocator = mem.Allocator;
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//! TODO mege this with `std.fs`
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const global_event_loop = Loop.instance orelse
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@compileError("std.event.fs currently only works with event-based I/O");
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pub const RequestNode = std.atomic.Queue(Request).Node;
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pub const Request = struct {
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msg: Msg,
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finish: Finish,
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pub const Finish = union(enum) {
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TickNode: Loop.NextTickNode,
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DeallocCloseOperation: *CloseOperation,
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NoAction,
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};
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pub const Msg = union(enum) {
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WriteV: WriteV,
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PWriteV: PWriteV,
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PReadV: PReadV,
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Open: Open,
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Close: Close,
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WriteFile: WriteFile,
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End, // special - means the fs thread should exit
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pub const WriteV = struct {
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fd: fd_t,
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iov: []const os.iovec_const,
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result: Error!void,
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pub const Error = os.WriteError;
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};
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pub const PWriteV = struct {
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fd: fd_t,
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iov: []const os.iovec_const,
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offset: usize,
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result: Error!void,
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pub const Error = os.WriteError;
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};
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pub const PReadV = struct {
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fd: fd_t,
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iov: []const os.iovec,
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offset: usize,
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result: Error!usize,
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pub const Error = os.ReadError;
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};
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pub const Open = struct {
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path: [:0]const u8,
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flags: u32,
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mode: File.Mode,
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result: Error!fd_t,
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pub const Error = File.OpenError;
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};
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pub const WriteFile = struct {
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path: [:0]const u8,
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contents: []const u8,
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mode: File.Mode,
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result: Error!void,
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pub const Error = File.OpenError || File.WriteError;
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};
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pub const Close = struct {
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fd: fd_t,
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};
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};
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};
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pub const PWriteVError = error{OutOfMemory} || File.WriteError;
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/// data - just the inner references - must live until pwritev frame completes.
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pub fn pwritev(allocator: *Allocator, fd: fd_t, data: []const []const u8, offset: usize) PWriteVError!void {
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switch (builtin.os) {
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.macosx,
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.linux,
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.freebsd,
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.netbsd,
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.dragonfly,
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=> {
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const iovecs = try allocator.alloc(os.iovec_const, data.len);
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defer allocator.free(iovecs);
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for (data) |buf, i| {
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iovecs[i] = os.iovec_const{
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.iov_base = buf.ptr,
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.iov_len = buf.len,
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};
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}
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return pwritevPosix(fd, iovecs, offset);
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},
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.windows => {
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const data_copy = try std.mem.dupe(allocator, []const u8, data);
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defer allocator.free(data_copy);
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return pwritevWindows(fd, data, offset);
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},
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else => @compileError("Unsupported OS"),
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}
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}
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/// data must outlive the returned frame
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pub fn pwritevWindows(fd: fd_t, data: []const []const u8, offset: usize) os.WindowsWriteError!void {
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if (data.len == 0) return;
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if (data.len == 1) return pwriteWindows(fd, data[0], offset);
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// TODO do these in parallel
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var off = offset;
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for (data) |buf| {
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try pwriteWindows(fd, buf, off);
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off += buf.len;
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}
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}
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pub fn pwriteWindows(fd: fd_t, data: []const u8, offset: u64) os.WindowsWriteError!void {
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var resume_node = Loop.ResumeNode.Basic{
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.base = Loop.ResumeNode{
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.id = Loop.ResumeNode.Id.Basic,
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.handle = @frame(),
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.overlapped = windows.OVERLAPPED{
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.Internal = 0,
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.InternalHigh = 0,
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.Offset = @truncate(u32, offset),
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.OffsetHigh = @truncate(u32, offset >> 32),
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.hEvent = null,
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},
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},
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};
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// TODO only call create io completion port once per fd
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_ = windows.CreateIoCompletionPort(fd, global_event_loop.os_data.io_port, undefined, undefined);
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global_event_loop.beginOneEvent();
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errdefer global_event_loop.finishOneEvent();
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errdefer {
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_ = windows.kernel32.CancelIoEx(fd, &resume_node.base.overlapped);
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}
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suspend {
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_ = windows.kernel32.WriteFile(fd, data.ptr, @intCast(windows.DWORD, data.len), null, &resume_node.base.overlapped);
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}
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var bytes_transferred: windows.DWORD = undefined;
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if (windows.kernel32.GetOverlappedResult(fd, &resume_node.base.overlapped, &bytes_transferred, windows.FALSE) == 0) {
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switch (windows.kernel32.GetLastError()) {
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windows.ERROR.IO_PENDING => unreachable,
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windows.ERROR.INVALID_USER_BUFFER => return error.SystemResources,
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windows.ERROR.NOT_ENOUGH_MEMORY => return error.SystemResources,
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windows.ERROR.OPERATION_ABORTED => return error.OperationAborted,
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windows.ERROR.NOT_ENOUGH_QUOTA => return error.SystemResources,
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windows.ERROR.BROKEN_PIPE => return error.BrokenPipe,
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else => |err| return windows.unexpectedError(err),
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}
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}
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}
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/// iovecs must live until pwritev frame completes.
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pub fn pwritevPosix(fd: fd_t, iovecs: []const os.iovec_const, offset: usize) os.WriteError!void {
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var req_node = RequestNode{
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.prev = null,
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.next = null,
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.data = Request{
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.msg = Request.Msg{
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.PWriteV = Request.Msg.PWriteV{
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.fd = fd,
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.iov = iovecs,
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.offset = offset,
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.result = undefined,
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},
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},
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.finish = Request.Finish{
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.TickNode = Loop.NextTickNode{
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.prev = null,
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.next = null,
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.data = @frame(),
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},
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},
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},
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};
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errdefer global_event_loop.posixFsCancel(&req_node);
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suspend {
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global_event_loop.posixFsRequest(&req_node);
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}
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return req_node.data.msg.PWriteV.result;
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}
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/// iovecs must live until pwritev frame completes.
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pub fn writevPosix(fd: fd_t, iovecs: []const os.iovec_const) os.WriteError!void {
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var req_node = RequestNode{
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.prev = null,
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.next = null,
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.data = Request{
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.msg = Request.Msg{
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.WriteV = Request.Msg.WriteV{
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.fd = fd,
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.iov = iovecs,
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.result = undefined,
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},
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},
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.finish = Request.Finish{
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.TickNode = Loop.NextTickNode{
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.prev = null,
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.next = null,
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.data = @frame(),
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},
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},
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},
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};
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suspend {
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global_event_loop.posixFsRequest(&req_node);
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}
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return req_node.data.msg.WriteV.result;
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}
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pub const PReadVError = error{OutOfMemory} || File.ReadError;
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/// data - just the inner references - must live until preadv frame completes.
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pub fn preadv(allocator: *Allocator, fd: fd_t, data: []const []u8, offset: usize) PReadVError!usize {
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assert(data.len != 0);
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switch (builtin.os) {
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.macosx,
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.linux,
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.freebsd,
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.netbsd,
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.dragonfly,
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=> {
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const iovecs = try allocator.alloc(os.iovec, data.len);
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defer allocator.free(iovecs);
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for (data) |buf, i| {
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iovecs[i] = os.iovec{
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.iov_base = buf.ptr,
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.iov_len = buf.len,
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};
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}
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return preadvPosix(fd, iovecs, offset);
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},
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.windows => {
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const data_copy = try std.mem.dupe(allocator, []u8, data);
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defer allocator.free(data_copy);
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return preadvWindows(fd, data_copy, offset);
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},
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else => @compileError("Unsupported OS"),
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}
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}
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/// data must outlive the returned frame
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pub fn preadvWindows(fd: fd_t, data: []const []u8, offset: u64) !usize {
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assert(data.len != 0);
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if (data.len == 1) return preadWindows(fd, data[0], offset);
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// TODO do these in parallel?
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var off: usize = 0;
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var iov_i: usize = 0;
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var inner_off: usize = 0;
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while (true) {
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const v = data[iov_i];
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const amt_read = try preadWindows(fd, v[inner_off .. v.len - inner_off], offset + off);
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off += amt_read;
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inner_off += amt_read;
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if (inner_off == v.len) {
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iov_i += 1;
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inner_off = 0;
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if (iov_i == data.len) {
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return off;
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}
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}
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if (amt_read == 0) return off; // EOF
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}
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}
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pub fn preadWindows(fd: fd_t, data: []u8, offset: u64) !usize {
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var resume_node = Loop.ResumeNode.Basic{
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.base = Loop.ResumeNode{
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.id = Loop.ResumeNode.Id.Basic,
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.handle = @frame(),
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.overlapped = windows.OVERLAPPED{
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.Internal = 0,
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.InternalHigh = 0,
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.Offset = @truncate(u32, offset),
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.OffsetHigh = @truncate(u32, offset >> 32),
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.hEvent = null,
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},
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},
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};
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// TODO only call create io completion port once per fd
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_ = windows.CreateIoCompletionPort(fd, global_event_loop.os_data.io_port, undefined, undefined) catch undefined;
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global_event_loop.beginOneEvent();
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errdefer global_event_loop.finishOneEvent();
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errdefer {
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_ = windows.kernel32.CancelIoEx(fd, &resume_node.base.overlapped);
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}
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suspend {
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_ = windows.kernel32.ReadFile(fd, data.ptr, @intCast(windows.DWORD, data.len), null, &resume_node.base.overlapped);
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}
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var bytes_transferred: windows.DWORD = undefined;
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if (windows.kernel32.GetOverlappedResult(fd, &resume_node.base.overlapped, &bytes_transferred, windows.FALSE) == 0) {
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switch (windows.kernel32.GetLastError()) {
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windows.ERROR.IO_PENDING => unreachable,
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windows.ERROR.OPERATION_ABORTED => return error.OperationAborted,
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windows.ERROR.BROKEN_PIPE => return error.BrokenPipe,
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windows.ERROR.HANDLE_EOF => return @as(usize, bytes_transferred),
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else => |err| return windows.unexpectedError(err),
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}
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}
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return @as(usize, bytes_transferred);
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}
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/// iovecs must live until preadv frame completes
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pub fn preadvPosix(fd: fd_t, iovecs: []const os.iovec, offset: usize) os.ReadError!usize {
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var req_node = RequestNode{
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.prev = null,
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.next = null,
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.data = Request{
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.msg = Request.Msg{
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.PReadV = Request.Msg.PReadV{
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.fd = fd,
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.iov = iovecs,
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.offset = offset,
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.result = undefined,
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},
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},
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.finish = Request.Finish{
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.TickNode = Loop.NextTickNode{
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.prev = null,
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.next = null,
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.data = @frame(),
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},
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},
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},
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};
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errdefer global_event_loop.posixFsCancel(&req_node);
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suspend {
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global_event_loop.posixFsRequest(&req_node);
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}
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return req_node.data.msg.PReadV.result;
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}
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pub fn openPosix(path: []const u8, flags: u32, mode: File.Mode) File.OpenError!fd_t {
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const path_c = try std.os.toPosixPath(path);
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var req_node = RequestNode{
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.prev = null,
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.next = null,
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.data = Request{
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.msg = Request.Msg{
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.Open = Request.Msg.Open{
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.path = path_c[0..path.len],
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.flags = flags,
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.mode = mode,
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.result = undefined,
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},
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},
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.finish = Request.Finish{
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.TickNode = Loop.NextTickNode{
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.prev = null,
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.next = null,
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.data = @frame(),
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},
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},
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},
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};
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errdefer global_event_loop.posixFsCancel(&req_node);
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suspend {
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global_event_loop.posixFsRequest(&req_node);
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}
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return req_node.data.msg.Open.result;
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}
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pub fn openRead(path: []const u8) File.OpenError!fd_t {
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switch (builtin.os) {
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.macosx, .linux, .freebsd, .netbsd, .dragonfly => {
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const O_LARGEFILE = if (@hasDecl(os, "O_LARGEFILE")) os.O_LARGEFILE else 0;
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const flags = O_LARGEFILE | os.O_RDONLY | os.O_CLOEXEC;
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return openPosix(path, flags, File.default_mode);
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},
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.windows => return windows.CreateFile(
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path,
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windows.GENERIC_READ,
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windows.FILE_SHARE_READ,
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null,
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windows.OPEN_EXISTING,
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windows.FILE_ATTRIBUTE_NORMAL | windows.FILE_FLAG_OVERLAPPED,
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null,
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),
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else => @compileError("Unsupported OS"),
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}
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}
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/// Creates if does not exist. Truncates the file if it exists.
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/// Uses the default mode.
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pub fn openWrite(path: []const u8) File.OpenError!fd_t {
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return openWriteMode(path, File.default_mode);
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}
|
|
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/// Creates if does not exist. Truncates the file if it exists.
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pub fn openWriteMode(path: []const u8, mode: File.Mode) File.OpenError!fd_t {
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|
switch (builtin.os) {
|
|
.macosx,
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|
.linux,
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|
.freebsd,
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|
.netbsd,
|
|
.dragonfly,
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=> {
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const O_LARGEFILE = if (@hasDecl(os, "O_LARGEFILE")) os.O_LARGEFILE else 0;
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const flags = O_LARGEFILE | os.O_WRONLY | os.O_CREAT | os.O_CLOEXEC | os.O_TRUNC;
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return openPosix(path, flags, File.default_mode);
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},
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|
.windows => return windows.CreateFile(
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path,
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windows.GENERIC_WRITE,
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windows.FILE_SHARE_WRITE | windows.FILE_SHARE_READ | windows.FILE_SHARE_DELETE,
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|
null,
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|
windows.CREATE_ALWAYS,
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windows.FILE_ATTRIBUTE_NORMAL | windows.FILE_FLAG_OVERLAPPED,
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|
null,
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|
),
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|
else => @compileError("Unsupported OS"),
|
|
}
|
|
}
|
|
|
|
/// Creates if does not exist. Does not truncate.
|
|
pub fn openReadWrite(path: []const u8, mode: File.Mode) File.OpenError!fd_t {
|
|
switch (builtin.os) {
|
|
.macosx, .linux, .freebsd, .netbsd, .dragonfly => {
|
|
const O_LARGEFILE = if (@hasDecl(os, "O_LARGEFILE")) os.O_LARGEFILE else 0;
|
|
const flags = O_LARGEFILE | os.O_RDWR | os.O_CREAT | os.O_CLOEXEC;
|
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return openPosix(path, flags, mode);
|
|
},
|
|
|
|
.windows => return windows.CreateFile(
|
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path,
|
|
windows.GENERIC_WRITE | windows.GENERIC_READ,
|
|
windows.FILE_SHARE_WRITE | windows.FILE_SHARE_READ | windows.FILE_SHARE_DELETE,
|
|
null,
|
|
windows.OPEN_ALWAYS,
|
|
windows.FILE_ATTRIBUTE_NORMAL | windows.FILE_FLAG_OVERLAPPED,
|
|
null,
|
|
),
|
|
|
|
else => @compileError("Unsupported OS"),
|
|
}
|
|
}
|
|
|
|
/// This abstraction helps to close file handles in defer expressions
|
|
/// without the possibility of failure and without the use of suspend points.
|
|
/// Start a `CloseOperation` before opening a file, so that you can defer
|
|
/// `CloseOperation.finish`.
|
|
/// If you call `setHandle` then finishing will close the fd; otherwise finishing
|
|
/// will deallocate the `CloseOperation`.
|
|
pub const CloseOperation = struct {
|
|
allocator: *Allocator,
|
|
os_data: OsData,
|
|
|
|
const OsData = switch (builtin.os) {
|
|
.linux, .macosx, .freebsd, .netbsd, .dragonfly => OsDataPosix,
|
|
|
|
.windows => struct {
|
|
handle: ?fd_t,
|
|
},
|
|
|
|
else => @compileError("Unsupported OS"),
|
|
};
|
|
|
|
const OsDataPosix = struct {
|
|
have_fd: bool,
|
|
close_req_node: RequestNode,
|
|
};
|
|
|
|
pub fn start(allocator: *Allocator) (error{OutOfMemory}!*CloseOperation) {
|
|
const self = try allocator.create(CloseOperation);
|
|
self.* = CloseOperation{
|
|
.allocator = allocator,
|
|
.os_data = switch (builtin.os) {
|
|
.linux, .macosx, .freebsd, .netbsd, .dragonfly => initOsDataPosix(self),
|
|
.windows => OsData{ .handle = null },
|
|
else => @compileError("Unsupported OS"),
|
|
},
|
|
};
|
|
return self;
|
|
}
|
|
|
|
fn initOsDataPosix(self: *CloseOperation) OsData {
|
|
return OsData{
|
|
.have_fd = false,
|
|
.close_req_node = RequestNode{
|
|
.prev = null,
|
|
.next = null,
|
|
.data = Request{
|
|
.msg = Request.Msg{
|
|
.Close = Request.Msg.Close{ .fd = undefined },
|
|
},
|
|
.finish = Request.Finish{ .DeallocCloseOperation = self },
|
|
},
|
|
},
|
|
};
|
|
}
|
|
|
|
/// Defer this after creating.
|
|
pub fn finish(self: *CloseOperation) void {
|
|
switch (builtin.os) {
|
|
.linux,
|
|
.macosx,
|
|
.freebsd,
|
|
.netbsd,
|
|
.dragonfly,
|
|
=> {
|
|
if (self.os_data.have_fd) {
|
|
global_event_loop.posixFsRequest(&self.os_data.close_req_node);
|
|
} else {
|
|
self.allocator.destroy(self);
|
|
}
|
|
},
|
|
.windows => {
|
|
if (self.os_data.handle) |handle| {
|
|
os.close(handle);
|
|
}
|
|
self.allocator.destroy(self);
|
|
},
|
|
else => @compileError("Unsupported OS"),
|
|
}
|
|
}
|
|
|
|
pub fn setHandle(self: *CloseOperation, handle: fd_t) void {
|
|
switch (builtin.os) {
|
|
.linux,
|
|
.macosx,
|
|
.freebsd,
|
|
.netbsd,
|
|
.dragonfly,
|
|
=> {
|
|
self.os_data.close_req_node.data.msg.Close.fd = handle;
|
|
self.os_data.have_fd = true;
|
|
},
|
|
.windows => {
|
|
self.os_data.handle = handle;
|
|
},
|
|
else => @compileError("Unsupported OS"),
|
|
}
|
|
}
|
|
|
|
/// Undo a `setHandle`.
|
|
pub fn clearHandle(self: *CloseOperation) void {
|
|
switch (builtin.os) {
|
|
.linux,
|
|
.macosx,
|
|
.freebsd,
|
|
.netbsd,
|
|
.dragonfly,
|
|
=> {
|
|
self.os_data.have_fd = false;
|
|
},
|
|
.windows => {
|
|
self.os_data.handle = null;
|
|
},
|
|
else => @compileError("Unsupported OS"),
|
|
}
|
|
}
|
|
|
|
pub fn getHandle(self: *CloseOperation) fd_t {
|
|
switch (builtin.os) {
|
|
.linux,
|
|
.macosx,
|
|
.freebsd,
|
|
.netbsd,
|
|
.dragonfly,
|
|
=> {
|
|
assert(self.os_data.have_fd);
|
|
return self.os_data.close_req_node.data.msg.Close.fd;
|
|
},
|
|
.windows => {
|
|
return self.os_data.handle.?;
|
|
},
|
|
else => @compileError("Unsupported OS"),
|
|
}
|
|
}
|
|
};
|
|
|
|
/// contents must remain alive until writeFile completes.
|
|
/// TODO make this atomic or provide writeFileAtomic and rename this one to writeFileTruncate
|
|
pub fn writeFile(allocator: *Allocator, path: []const u8, contents: []const u8) !void {
|
|
return writeFileMode(allocator, path, contents, File.default_mode);
|
|
}
|
|
|
|
/// contents must remain alive until writeFile completes.
|
|
pub fn writeFileMode(allocator: *Allocator, path: []const u8, contents: []const u8, mode: File.Mode) !void {
|
|
switch (builtin.os) {
|
|
.linux,
|
|
.macosx,
|
|
.freebsd,
|
|
.netbsd,
|
|
.dragonfly,
|
|
=> return writeFileModeThread(allocator, path, contents, mode),
|
|
.windows => return writeFileWindows(path, contents),
|
|
else => @compileError("Unsupported OS"),
|
|
}
|
|
}
|
|
|
|
fn writeFileWindows(path: []const u8, contents: []const u8) !void {
|
|
const handle = try windows.CreateFile(
|
|
path,
|
|
windows.GENERIC_WRITE,
|
|
windows.FILE_SHARE_WRITE | windows.FILE_SHARE_READ | windows.FILE_SHARE_DELETE,
|
|
null,
|
|
windows.CREATE_ALWAYS,
|
|
windows.FILE_ATTRIBUTE_NORMAL | windows.FILE_FLAG_OVERLAPPED,
|
|
null,
|
|
);
|
|
defer os.close(handle);
|
|
|
|
try pwriteWindows(handle, contents, 0);
|
|
}
|
|
|
|
fn writeFileModeThread(allocator: *Allocator, path: []const u8, contents: []const u8, mode: File.Mode) !void {
|
|
const path_with_null = try std.cstr.addNullByte(allocator, path);
|
|
defer allocator.free(path_with_null);
|
|
|
|
var req_node = RequestNode{
|
|
.prev = null,
|
|
.next = null,
|
|
.data = Request{
|
|
.msg = Request.Msg{
|
|
.WriteFile = Request.Msg.WriteFile{
|
|
.path = path_with_null[0..path.len],
|
|
.contents = contents,
|
|
.mode = mode,
|
|
.result = undefined,
|
|
},
|
|
},
|
|
.finish = Request.Finish{
|
|
.TickNode = Loop.NextTickNode{
|
|
.prev = null,
|
|
.next = null,
|
|
.data = @frame(),
|
|
},
|
|
},
|
|
},
|
|
};
|
|
|
|
errdefer global_event_loop.posixFsCancel(&req_node);
|
|
|
|
suspend {
|
|
global_event_loop.posixFsRequest(&req_node);
|
|
}
|
|
|
|
return req_node.data.msg.WriteFile.result;
|
|
}
|
|
|
|
/// The frame resumes when the last data has been confirmed written, but before the file handle
|
|
/// is closed.
|
|
/// Caller owns returned memory.
|
|
pub fn readFile(allocator: *Allocator, file_path: []const u8, max_size: usize) ![]u8 {
|
|
var close_op = try CloseOperation.start(allocator);
|
|
defer close_op.finish();
|
|
|
|
const fd = try openRead(file_path);
|
|
close_op.setHandle(fd);
|
|
|
|
var list = std.ArrayList(u8).init(allocator);
|
|
defer list.deinit();
|
|
|
|
while (true) {
|
|
try list.ensureCapacity(list.len + mem.page_size);
|
|
const buf = list.items[list.len..];
|
|
const buf_array = [_][]u8{buf};
|
|
const amt = try preadv(allocator, fd, &buf_array, list.len);
|
|
list.len += amt;
|
|
if (list.len > max_size) {
|
|
return error.FileTooBig;
|
|
}
|
|
if (amt < buf.len) {
|
|
return list.toOwnedSlice();
|
|
}
|
|
}
|
|
}
|
|
|
|
pub const WatchEventId = enum {
|
|
CloseWrite,
|
|
Delete,
|
|
};
|
|
|
|
fn eqlString(a: []const u16, b: []const u16) bool {
|
|
if (a.len != b.len) return false;
|
|
if (a.ptr == b.ptr) return true;
|
|
return mem.compare(u16, a, b) == .Equal;
|
|
}
|
|
|
|
fn hashString(s: []const u16) u32 {
|
|
return @truncate(u32, std.hash.Wyhash.hash(0, @sliceToBytes(s)));
|
|
}
|
|
|
|
pub const WatchEventError = error{
|
|
UserResourceLimitReached,
|
|
SystemResources,
|
|
AccessDenied,
|
|
Unexpected, // TODO remove this possibility
|
|
};
|
|
|
|
pub fn Watch(comptime V: type) type {
|
|
return struct {
|
|
channel: *event.Channel(Event.Error!Event),
|
|
os_data: OsData,
|
|
allocator: *Allocator,
|
|
|
|
const OsData = switch (builtin.os) {
|
|
// TODO https://github.com/ziglang/zig/issues/3778
|
|
.macosx, .freebsd, .netbsd, .dragonfly => KqOsData,
|
|
.linux => LinuxOsData,
|
|
.windows => WindowsOsData,
|
|
|
|
else => @compileError("Unsupported OS"),
|
|
};
|
|
|
|
const KqOsData = struct {
|
|
file_table: FileTable,
|
|
table_lock: event.Lock,
|
|
|
|
const FileTable = std.StringHashMap(*Put);
|
|
const Put = struct {
|
|
putter_frame: @Frame(kqPutEvents),
|
|
cancelled: bool = false,
|
|
value: V,
|
|
};
|
|
};
|
|
|
|
const WindowsOsData = struct {
|
|
table_lock: event.Lock,
|
|
dir_table: DirTable,
|
|
all_putters: std.atomic.Queue(Put),
|
|
ref_count: std.atomic.Int(usize),
|
|
|
|
const Put = struct {
|
|
putter: anyframe,
|
|
cancelled: bool = false,
|
|
};
|
|
|
|
const DirTable = std.StringHashMap(*Dir);
|
|
const FileTable = std.HashMap([]const u16, V, hashString, eqlString);
|
|
|
|
const Dir = struct {
|
|
putter_frame: @Frame(windowsDirReader),
|
|
file_table: FileTable,
|
|
table_lock: event.Lock,
|
|
};
|
|
};
|
|
|
|
const LinuxOsData = struct {
|
|
putter_frame: @Frame(linuxEventPutter),
|
|
inotify_fd: i32,
|
|
wd_table: WdTable,
|
|
table_lock: event.Lock,
|
|
cancelled: bool = false,
|
|
|
|
const WdTable = std.AutoHashMap(i32, Dir);
|
|
const FileTable = std.StringHashMap(V);
|
|
|
|
const Dir = struct {
|
|
dirname: []const u8,
|
|
file_table: FileTable,
|
|
};
|
|
};
|
|
|
|
const Self = @This();
|
|
|
|
pub const Event = struct {
|
|
id: Id,
|
|
data: V,
|
|
|
|
pub const Id = WatchEventId;
|
|
pub const Error = WatchEventError;
|
|
};
|
|
|
|
pub fn init(allocator: *Allocator, event_buf_count: usize) !*Self {
|
|
const channel = try allocator.create(event.Channel(Event.Error!Event));
|
|
errdefer allocator.destroy(channel);
|
|
var buf = try allocator.alloc(Event.Error!Event, event_buf_count);
|
|
errdefer allocator.free(buf);
|
|
channel.init(buf);
|
|
errdefer channel.deinit();
|
|
|
|
const self = try allocator.create(Self);
|
|
errdefer allocator.destroy(self);
|
|
|
|
switch (builtin.os) {
|
|
.linux => {
|
|
const inotify_fd = try os.inotify_init1(os.linux.IN_NONBLOCK | os.linux.IN_CLOEXEC);
|
|
errdefer os.close(inotify_fd);
|
|
|
|
self.* = Self{
|
|
.allocator = allocator,
|
|
.channel = channel,
|
|
.os_data = OsData{
|
|
.putter_frame = undefined,
|
|
.inotify_fd = inotify_fd,
|
|
.wd_table = OsData.WdTable.init(allocator),
|
|
.table_lock = event.Lock.init(),
|
|
},
|
|
};
|
|
|
|
self.os_data.putter_frame = async self.linuxEventPutter();
|
|
return self;
|
|
},
|
|
|
|
.windows => {
|
|
self.* = Self{
|
|
.allocator = allocator,
|
|
.channel = channel,
|
|
.os_data = OsData{
|
|
.table_lock = event.Lock.init(),
|
|
.dir_table = OsData.DirTable.init(allocator),
|
|
.ref_count = std.atomic.Int(usize).init(1),
|
|
.all_putters = std.atomic.Queue(anyframe).init(),
|
|
},
|
|
};
|
|
return self;
|
|
},
|
|
|
|
.macosx, .freebsd, .netbsd, .dragonfly => {
|
|
self.* = Self{
|
|
.allocator = allocator,
|
|
.channel = channel,
|
|
.os_data = OsData{
|
|
.table_lock = event.Lock.init(),
|
|
.file_table = OsData.FileTable.init(allocator),
|
|
},
|
|
};
|
|
return self;
|
|
},
|
|
else => @compileError("Unsupported OS"),
|
|
}
|
|
}
|
|
|
|
/// All addFile calls and removeFile calls must have completed.
|
|
pub fn deinit(self: *Self) void {
|
|
switch (builtin.os) {
|
|
.macosx, .freebsd, .netbsd, .dragonfly => {
|
|
// TODO we need to cancel the frames before destroying the lock
|
|
self.os_data.table_lock.deinit();
|
|
var it = self.os_data.file_table.iterator();
|
|
while (it.next()) |entry| {
|
|
entry.cancelled = true;
|
|
await entry.value.putter;
|
|
self.allocator.free(entry.key);
|
|
self.allocator.free(entry.value);
|
|
}
|
|
self.channel.deinit();
|
|
self.allocator.destroy(self.channel.buffer_nodes);
|
|
self.allocator.destroy(self);
|
|
},
|
|
.linux => {
|
|
self.os_data.cancelled = true;
|
|
await self.os_data.putter_frame;
|
|
self.allocator.destroy(self);
|
|
},
|
|
.windows => {
|
|
while (self.os_data.all_putters.get()) |putter_node| {
|
|
putter_node.cancelled = true;
|
|
await putter_node.frame;
|
|
}
|
|
self.deref();
|
|
},
|
|
else => @compileError("Unsupported OS"),
|
|
}
|
|
}
|
|
|
|
fn ref(self: *Self) void {
|
|
_ = self.os_data.ref_count.incr();
|
|
}
|
|
|
|
fn deref(self: *Self) void {
|
|
if (self.os_data.ref_count.decr() == 1) {
|
|
self.os_data.table_lock.deinit();
|
|
var it = self.os_data.dir_table.iterator();
|
|
while (it.next()) |entry| {
|
|
self.allocator.free(entry.key);
|
|
self.allocator.destroy(entry.value);
|
|
}
|
|
self.os_data.dir_table.deinit();
|
|
self.channel.deinit();
|
|
self.allocator.destroy(self.channel.buffer_nodes);
|
|
self.allocator.destroy(self);
|
|
}
|
|
}
|
|
|
|
pub fn addFile(self: *Self, file_path: []const u8, value: V) !?V {
|
|
switch (builtin.os) {
|
|
.macosx, .freebsd, .netbsd, .dragonfly => return addFileKEvent(self, file_path, value),
|
|
.linux => return addFileLinux(self, file_path, value),
|
|
.windows => return addFileWindows(self, file_path, value),
|
|
else => @compileError("Unsupported OS"),
|
|
}
|
|
}
|
|
|
|
fn addFileKEvent(self: *Self, file_path: []const u8, value: V) !?V {
|
|
const resolved_path = try std.fs.path.resolve(self.allocator, [_][]const u8{file_path});
|
|
var resolved_path_consumed = false;
|
|
defer if (!resolved_path_consumed) self.allocator.free(resolved_path);
|
|
|
|
var close_op = try CloseOperation.start(self.allocator);
|
|
var close_op_consumed = false;
|
|
defer if (!close_op_consumed) close_op.finish();
|
|
|
|
const flags = if (comptime std.Target.current.isDarwin()) os.O_SYMLINK | os.O_EVTONLY else 0;
|
|
const mode = 0;
|
|
const fd = try openPosix(self.allocator, resolved_path, flags, mode);
|
|
close_op.setHandle(fd);
|
|
|
|
var put = try self.allocator.create(OsData.Put);
|
|
errdefer self.allocator.destroy(put);
|
|
put.* = OsData.Put{
|
|
.value = value,
|
|
.putter_frame = undefined,
|
|
};
|
|
put.putter_frame = async self.kqPutEvents(close_op, put);
|
|
close_op_consumed = true;
|
|
errdefer {
|
|
put.cancelled = true;
|
|
await put.putter_frame;
|
|
}
|
|
|
|
const result = blk: {
|
|
const held = self.os_data.table_lock.acquire();
|
|
defer held.release();
|
|
|
|
const gop = try self.os_data.file_table.getOrPut(resolved_path);
|
|
if (gop.found_existing) {
|
|
const prev_value = gop.kv.value.value;
|
|
await gop.kv.value.putter_frame;
|
|
gop.kv.value = put;
|
|
break :blk prev_value;
|
|
} else {
|
|
resolved_path_consumed = true;
|
|
gop.kv.value = put;
|
|
break :blk null;
|
|
}
|
|
};
|
|
|
|
return result;
|
|
}
|
|
|
|
fn kqPutEvents(self: *Self, close_op: *CloseOperation, put: *OsData.Put) void {
|
|
global_event_loop.beginOneEvent();
|
|
|
|
defer {
|
|
close_op.finish();
|
|
global_event_loop.finishOneEvent();
|
|
}
|
|
|
|
while (!put.cancelled) {
|
|
if (global_event_loop.bsdWaitKev(
|
|
@intCast(usize, close_op.getHandle()),
|
|
os.EVFILT_VNODE,
|
|
os.NOTE_WRITE | os.NOTE_DELETE,
|
|
)) |kev| {
|
|
// TODO handle EV_ERROR
|
|
if (kev.fflags & os.NOTE_DELETE != 0) {
|
|
self.channel.put(Self.Event{
|
|
.id = Event.Id.Delete,
|
|
.data = put.value,
|
|
});
|
|
} else if (kev.fflags & os.NOTE_WRITE != 0) {
|
|
self.channel.put(Self.Event{
|
|
.id = Event.Id.CloseWrite,
|
|
.data = put.value,
|
|
});
|
|
}
|
|
} else |err| switch (err) {
|
|
error.EventNotFound => unreachable,
|
|
error.ProcessNotFound => unreachable,
|
|
error.Overflow => unreachable,
|
|
error.AccessDenied, error.SystemResources => |casted_err| {
|
|
self.channel.put(casted_err);
|
|
},
|
|
}
|
|
}
|
|
}
|
|
|
|
fn addFileLinux(self: *Self, file_path: []const u8, value: V) !?V {
|
|
const dirname = std.fs.path.dirname(file_path) orelse ".";
|
|
const dirname_with_null = try std.cstr.addNullByte(self.allocator, dirname);
|
|
var dirname_with_null_consumed = false;
|
|
defer if (!dirname_with_null_consumed) self.channel.free(dirname_with_null);
|
|
|
|
const basename = std.fs.path.basename(file_path);
|
|
const basename_with_null = try std.cstr.addNullByte(self.allocator, basename);
|
|
var basename_with_null_consumed = false;
|
|
defer if (!basename_with_null_consumed) self.allocator.free(basename_with_null);
|
|
|
|
const wd = try os.inotify_add_watchC(
|
|
self.os_data.inotify_fd,
|
|
dirname_with_null.ptr,
|
|
os.linux.IN_CLOSE_WRITE | os.linux.IN_ONLYDIR | os.linux.IN_EXCL_UNLINK,
|
|
);
|
|
// wd is either a newly created watch or an existing one.
|
|
|
|
const held = self.os_data.table_lock.acquire();
|
|
defer held.release();
|
|
|
|
const gop = try self.os_data.wd_table.getOrPut(wd);
|
|
if (!gop.found_existing) {
|
|
gop.kv.value = OsData.Dir{
|
|
.dirname = dirname_with_null,
|
|
.file_table = OsData.FileTable.init(self.allocator),
|
|
};
|
|
dirname_with_null_consumed = true;
|
|
}
|
|
const dir = &gop.kv.value;
|
|
|
|
const file_table_gop = try dir.file_table.getOrPut(basename_with_null);
|
|
if (file_table_gop.found_existing) {
|
|
const prev_value = file_table_gop.kv.value;
|
|
file_table_gop.kv.value = value;
|
|
return prev_value;
|
|
} else {
|
|
file_table_gop.kv.value = value;
|
|
basename_with_null_consumed = true;
|
|
return null;
|
|
}
|
|
}
|
|
|
|
fn addFileWindows(self: *Self, file_path: []const u8, value: V) !?V {
|
|
// TODO we might need to convert dirname and basename to canonical file paths ("short"?)
|
|
const dirname = try std.mem.dupe(self.allocator, u8, std.fs.path.dirname(file_path) orelse ".");
|
|
var dirname_consumed = false;
|
|
defer if (!dirname_consumed) self.allocator.free(dirname);
|
|
|
|
const dirname_utf16le = try std.unicode.utf8ToUtf16LeWithNull(self.allocator, dirname);
|
|
defer self.allocator.free(dirname_utf16le);
|
|
|
|
// TODO https://github.com/ziglang/zig/issues/265
|
|
const basename = std.fs.path.basename(file_path);
|
|
const basename_utf16le_null = try std.unicode.utf8ToUtf16LeWithNull(self.allocator, basename);
|
|
var basename_utf16le_null_consumed = false;
|
|
defer if (!basename_utf16le_null_consumed) self.allocator.free(basename_utf16le_null);
|
|
const basename_utf16le_no_null = basename_utf16le_null[0 .. basename_utf16le_null.len - 1];
|
|
|
|
const dir_handle = try windows.CreateFileW(
|
|
dirname_utf16le.ptr,
|
|
windows.FILE_LIST_DIRECTORY,
|
|
windows.FILE_SHARE_READ | windows.FILE_SHARE_DELETE | windows.FILE_SHARE_WRITE,
|
|
null,
|
|
windows.OPEN_EXISTING,
|
|
windows.FILE_FLAG_BACKUP_SEMANTICS | windows.FILE_FLAG_OVERLAPPED,
|
|
null,
|
|
);
|
|
var dir_handle_consumed = false;
|
|
defer if (!dir_handle_consumed) windows.CloseHandle(dir_handle);
|
|
|
|
const held = self.os_data.table_lock.acquire();
|
|
defer held.release();
|
|
|
|
const gop = try self.os_data.dir_table.getOrPut(dirname);
|
|
if (gop.found_existing) {
|
|
const dir = gop.kv.value;
|
|
const held_dir_lock = dir.table_lock.acquire();
|
|
defer held_dir_lock.release();
|
|
|
|
const file_gop = try dir.file_table.getOrPut(basename_utf16le_no_null);
|
|
if (file_gop.found_existing) {
|
|
const prev_value = file_gop.kv.value;
|
|
file_gop.kv.value = value;
|
|
return prev_value;
|
|
} else {
|
|
file_gop.kv.value = value;
|
|
basename_utf16le_null_consumed = true;
|
|
return null;
|
|
}
|
|
} else {
|
|
errdefer _ = self.os_data.dir_table.remove(dirname);
|
|
const dir = try self.allocator.create(OsData.Dir);
|
|
errdefer self.allocator.destroy(dir);
|
|
|
|
dir.* = OsData.Dir{
|
|
.file_table = OsData.FileTable.init(self.allocator),
|
|
.table_lock = event.Lock.init(),
|
|
.putter_frame = undefined,
|
|
};
|
|
gop.kv.value = dir;
|
|
assert((try dir.file_table.put(basename_utf16le_no_null, value)) == null);
|
|
basename_utf16le_null_consumed = true;
|
|
|
|
dir.putter_frame = async self.windowsDirReader(dir_handle, dir);
|
|
dir_handle_consumed = true;
|
|
|
|
dirname_consumed = true;
|
|
|
|
return null;
|
|
}
|
|
}
|
|
|
|
fn windowsDirReader(self: *Self, dir_handle: windows.HANDLE, dir: *OsData.Dir) void {
|
|
self.ref();
|
|
defer self.deref();
|
|
|
|
defer os.close(dir_handle);
|
|
|
|
var putter_node = std.atomic.Queue(anyframe).Node{
|
|
.data = .{ .putter = @frame() },
|
|
.prev = null,
|
|
.next = null,
|
|
};
|
|
self.os_data.all_putters.put(&putter_node);
|
|
defer _ = self.os_data.all_putters.remove(&putter_node);
|
|
|
|
var resume_node = Loop.ResumeNode.Basic{
|
|
.base = Loop.ResumeNode{
|
|
.id = Loop.ResumeNode.Id.Basic,
|
|
.handle = @frame(),
|
|
.overlapped = windows.OVERLAPPED{
|
|
.Internal = 0,
|
|
.InternalHigh = 0,
|
|
.Offset = 0,
|
|
.OffsetHigh = 0,
|
|
.hEvent = null,
|
|
},
|
|
},
|
|
};
|
|
var event_buf: [4096]u8 align(@alignOf(windows.FILE_NOTIFY_INFORMATION)) = undefined;
|
|
|
|
// TODO handle this error not in the channel but in the setup
|
|
_ = windows.CreateIoCompletionPort(
|
|
dir_handle,
|
|
global_event_loop.os_data.io_port,
|
|
undefined,
|
|
undefined,
|
|
) catch |err| {
|
|
self.channel.put(err);
|
|
return;
|
|
};
|
|
|
|
while (!putter_node.data.cancelled) {
|
|
{
|
|
// TODO only 1 beginOneEvent for the whole function
|
|
global_event_loop.beginOneEvent();
|
|
errdefer global_event_loop.finishOneEvent();
|
|
errdefer {
|
|
_ = windows.kernel32.CancelIoEx(dir_handle, &resume_node.base.overlapped);
|
|
}
|
|
suspend {
|
|
_ = windows.kernel32.ReadDirectoryChangesW(
|
|
dir_handle,
|
|
&event_buf,
|
|
@intCast(windows.DWORD, event_buf.len),
|
|
windows.FALSE, // watch subtree
|
|
windows.FILE_NOTIFY_CHANGE_FILE_NAME | windows.FILE_NOTIFY_CHANGE_DIR_NAME |
|
|
windows.FILE_NOTIFY_CHANGE_ATTRIBUTES | windows.FILE_NOTIFY_CHANGE_SIZE |
|
|
windows.FILE_NOTIFY_CHANGE_LAST_WRITE | windows.FILE_NOTIFY_CHANGE_LAST_ACCESS |
|
|
windows.FILE_NOTIFY_CHANGE_CREATION | windows.FILE_NOTIFY_CHANGE_SECURITY,
|
|
null, // number of bytes transferred (unused for async)
|
|
&resume_node.base.overlapped,
|
|
null, // completion routine - unused because we use IOCP
|
|
);
|
|
}
|
|
}
|
|
var bytes_transferred: windows.DWORD = undefined;
|
|
if (windows.kernel32.GetOverlappedResult(dir_handle, &resume_node.base.overlapped, &bytes_transferred, windows.FALSE) == 0) {
|
|
const err = switch (windows.kernel32.GetLastError()) {
|
|
else => |err| windows.unexpectedError(err),
|
|
};
|
|
self.channel.put(err);
|
|
} else {
|
|
// can't use @bytesToSlice because of the special variable length name field
|
|
var ptr = event_buf[0..].ptr;
|
|
const end_ptr = ptr + bytes_transferred;
|
|
var ev: *windows.FILE_NOTIFY_INFORMATION = undefined;
|
|
while (@ptrToInt(ptr) < @ptrToInt(end_ptr)) : (ptr += ev.NextEntryOffset) {
|
|
ev = @ptrCast(*windows.FILE_NOTIFY_INFORMATION, ptr);
|
|
const emit = switch (ev.Action) {
|
|
windows.FILE_ACTION_REMOVED => WatchEventId.Delete,
|
|
windows.FILE_ACTION_MODIFIED => WatchEventId.CloseWrite,
|
|
else => null,
|
|
};
|
|
if (emit) |id| {
|
|
const basename_utf16le = ([*]u16)(&ev.FileName)[0 .. ev.FileNameLength / 2];
|
|
const user_value = blk: {
|
|
const held = dir.table_lock.acquire();
|
|
defer held.release();
|
|
|
|
if (dir.file_table.get(basename_utf16le)) |entry| {
|
|
break :blk entry.value;
|
|
} else {
|
|
break :blk null;
|
|
}
|
|
};
|
|
if (user_value) |v| {
|
|
self.channel.put(Event{
|
|
.id = id,
|
|
.data = v,
|
|
});
|
|
}
|
|
}
|
|
if (ev.NextEntryOffset == 0) break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn removeFile(self: *Self, file_path: []const u8) ?V {
|
|
@panic("TODO");
|
|
}
|
|
|
|
fn linuxEventPutter(self: *Self) void {
|
|
global_event_loop.beginOneEvent();
|
|
|
|
defer {
|
|
self.os_data.table_lock.deinit();
|
|
var wd_it = self.os_data.wd_table.iterator();
|
|
while (wd_it.next()) |wd_entry| {
|
|
var file_it = wd_entry.value.file_table.iterator();
|
|
while (file_it.next()) |file_entry| {
|
|
self.allocator.free(file_entry.key);
|
|
}
|
|
self.allocator.free(wd_entry.value.dirname);
|
|
wd_entry.value.file_table.deinit();
|
|
}
|
|
self.os_data.wd_table.deinit();
|
|
global_event_loop.finishOneEvent();
|
|
os.close(self.os_data.inotify_fd);
|
|
self.channel.deinit();
|
|
self.allocator.free(self.channel.buffer_nodes);
|
|
}
|
|
|
|
var event_buf: [4096]u8 align(@alignOf(os.linux.inotify_event)) = undefined;
|
|
|
|
while (!self.os_data.cancelled) {
|
|
const rc = os.linux.read(self.os_data.inotify_fd, &event_buf, event_buf.len);
|
|
const errno = os.linux.getErrno(rc);
|
|
switch (errno) {
|
|
0 => {
|
|
// can't use @bytesToSlice because of the special variable length name field
|
|
var ptr = event_buf[0..].ptr;
|
|
const end_ptr = ptr + event_buf.len;
|
|
var ev: *os.linux.inotify_event = undefined;
|
|
while (@ptrToInt(ptr) < @ptrToInt(end_ptr)) : (ptr += @sizeOf(os.linux.inotify_event) + ev.len) {
|
|
ev = @ptrCast(*os.linux.inotify_event, ptr);
|
|
if (ev.mask & os.linux.IN_CLOSE_WRITE == os.linux.IN_CLOSE_WRITE) {
|
|
const basename_ptr = ptr + @sizeOf(os.linux.inotify_event);
|
|
// `ev.len` counts all bytes in `ev.name` including terminating null byte.
|
|
const basename_with_null = basename_ptr[0..ev.len];
|
|
const user_value = blk: {
|
|
const held = self.os_data.table_lock.acquire();
|
|
defer held.release();
|
|
|
|
const dir = &self.os_data.wd_table.get(ev.wd).?.value;
|
|
if (dir.file_table.get(basename_with_null)) |entry| {
|
|
break :blk entry.value;
|
|
} else {
|
|
break :blk null;
|
|
}
|
|
};
|
|
if (user_value) |v| {
|
|
self.channel.put(Event{
|
|
.id = WatchEventId.CloseWrite,
|
|
.data = v,
|
|
});
|
|
}
|
|
}
|
|
}
|
|
},
|
|
os.linux.EINTR => continue,
|
|
os.linux.EINVAL => unreachable,
|
|
os.linux.EFAULT => unreachable,
|
|
os.linux.EAGAIN => {
|
|
global_event_loop.linuxWaitFd(self.os_data.inotify_fd, os.linux.EPOLLET | os.linux.EPOLLIN | os.EPOLLONESHOT);
|
|
},
|
|
else => unreachable,
|
|
}
|
|
}
|
|
}
|
|
};
|
|
}
|
|
|
|
const test_tmp_dir = "std_event_fs_test";
|
|
|
|
test "write a file, watch it, write it again" {
|
|
// TODO provide a way to run tests in evented I/O mode
|
|
if (!std.io.is_async) return error.SkipZigTest;
|
|
|
|
const allocator = std.heap.page_allocator;
|
|
|
|
// TODO move this into event loop too
|
|
try os.makePath(allocator, test_tmp_dir);
|
|
defer os.deleteTree(test_tmp_dir) catch {};
|
|
|
|
return testFsWatch(&allocator);
|
|
}
|
|
|
|
fn testFsWatch(allocator: *Allocator) !void {
|
|
const file_path = try std.fs.path.join(allocator, [_][]const u8{ test_tmp_dir, "file.txt" });
|
|
defer allocator.free(file_path);
|
|
|
|
const contents =
|
|
\\line 1
|
|
\\line 2
|
|
;
|
|
const line2_offset = 7;
|
|
|
|
// first just write then read the file
|
|
try writeFile(allocator, file_path, contents);
|
|
|
|
const read_contents = try readFile(allocator, file_path, 1024 * 1024);
|
|
testing.expectEqualSlices(u8, contents, read_contents);
|
|
|
|
// now watch the file
|
|
var watch = try Watch(void).init(allocator, 0);
|
|
defer watch.deinit();
|
|
|
|
testing.expect((try watch.addFile(file_path, {})) == null);
|
|
|
|
const ev = watch.channel.get();
|
|
var ev_consumed = false;
|
|
defer if (!ev_consumed) await ev;
|
|
|
|
// overwrite line 2
|
|
const fd = try await openReadWrite(file_path, File.default_mode);
|
|
{
|
|
defer os.close(fd);
|
|
|
|
try pwritev(allocator, fd, []const []const u8{"lorem ipsum"}, line2_offset);
|
|
}
|
|
|
|
ev_consumed = true;
|
|
switch ((try await ev).id) {
|
|
WatchEventId.CloseWrite => {},
|
|
WatchEventId.Delete => @panic("wrong event"),
|
|
}
|
|
const contents_updated = try readFile(allocator, file_path, 1024 * 1024);
|
|
testing.expectEqualSlices(u8,
|
|
\\line 1
|
|
\\lorem ipsum
|
|
, contents_updated);
|
|
|
|
// TODO test deleting the file and then re-adding it. we should get events for both
|
|
}
|
|
|
|
pub const OutStream = struct {
|
|
fd: fd_t,
|
|
stream: Stream,
|
|
allocator: *Allocator,
|
|
offset: usize,
|
|
|
|
pub const Error = File.WriteError;
|
|
pub const Stream = event.io.OutStream(Error);
|
|
|
|
pub fn init(allocator: *Allocator, fd: fd_t, offset: usize) OutStream {
|
|
return OutStream{
|
|
.fd = fd,
|
|
.offset = offset,
|
|
.stream = Stream{ .writeFn = writeFn },
|
|
};
|
|
}
|
|
|
|
fn writeFn(out_stream: *Stream, bytes: []const u8) Error!void {
|
|
const self = @fieldParentPtr(OutStream, "stream", out_stream);
|
|
const offset = self.offset;
|
|
self.offset += bytes.len;
|
|
return pwritev(self.allocator, self.fd, [_][]const u8{bytes}, offset);
|
|
}
|
|
};
|
|
|
|
pub const InStream = struct {
|
|
fd: fd_t,
|
|
stream: Stream,
|
|
allocator: *Allocator,
|
|
offset: usize,
|
|
|
|
pub const Error = PReadVError; // TODO make this not have OutOfMemory
|
|
pub const Stream = event.io.InStream(Error);
|
|
|
|
pub fn init(allocator: *Allocator, fd: fd_t, offset: usize) InStream {
|
|
return InStream{
|
|
.fd = fd,
|
|
.offset = offset,
|
|
.stream = Stream{ .readFn = readFn },
|
|
};
|
|
}
|
|
|
|
fn readFn(in_stream: *Stream, bytes: []u8) Error!usize {
|
|
const self = @fieldParentPtr(InStream, "stream", in_stream);
|
|
const amt = try preadv(self.allocator, self.fd, [_][]u8{bytes}, self.offset);
|
|
self.offset += amt;
|
|
return amt;
|
|
}
|
|
};
|